命令-dumpe2fs

[root@Centos6.8-180 ~]# dumpe2fs /dev/sda3
dumpe2fs 1.41.12 (17-May-2010)
Filesystem volume name:   MYDATA
Last mounted on:          <not available>
Filesystem UUID:          98873684-812d-40ae-86ad-5065e17d205b
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype sparse_super large_file
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              655360
Block count:              2620699
Reserved block count:     52413
Free blocks:              2541003
Free inodes:              655349
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      639
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Filesystem created:       Tue Dec  6 07:06:14 2016
Last mount time:          n/a
Last write time:          Tue Dec  6 09:24:16 2016
Mount count:              0
Maximum mount count:      26
Last checked:             Tue Dec  6 07:06:14 2016
Check interval:           15552000 (6 months)
Next check after:         Sun Jun  4 07:06:14 2017
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      784da73d-a979-465d-ae10-5093a3cc0420
Journal backup:           inode blocks
Journal features:         (none)
日志大小:             128M
Journal length:           32768
Journal sequence:         0x00000001
Journal start:            0
Group 0: (Blocks 0-32767)
  主 superblock at 0, Group descriptors at 1-1
  保留的GDT块位于 2-640
  Block bitmap at 641 (+641), Inode bitmap at 642 (+642)
  Inode表位于 643-1154 (+643)
  31607 free blocks, 8181 free inodes, 2 directories
  可用块数: 1161-32767
  可用inode数: 12-8192
Group 1: (Blocks 32768-65535)
  备份 superblock at 32768, Group descriptors at 32769-32769
  保留的GDT块位于 32770-33408
  Block bitmap at 33409 (+641), Inode bitmap at 33410 (+642)
  Inode表位于 33411-33922 (+643)
  31613 free blocks, 8192 free inodes, 0 directories
  可用块数: 33923-65535
  可用inode数: 8193-16384
Group 2: (Blocks 65536-98303)
  Block bitmap at 65536 (+0), Inode bitmap at 65537 (+1)
  Inode表位于 65538-66049 (+2)
  32254 free blocks, 8192 free inodes, 0 directories
  可用块数: 66050-98303
  可用inode数: 16385-24576
Group 3: (Blocks 98304-131071)
  备份 superblock at 98304, Group descriptors at 98305-98305
  保留的GDT块位于 98306-98944
  Block bitmap at 98945 (+641), Inode bitmap at 98946 (+642)
  Inode表位于 98947-99458 (+643)
  31613 free blocks, 8192 free inodes, 0 directories
  可用块数: 99459-131071
  可用inode数: 24577-32768
...以下省略...

[root@Centos6.8-180 ~]# dumpe2fs -h /dev/sda3
dumpe2fs 1.41.12 (17-May-2010)
Filesystem volume name:   MYDATA
Last mounted on:          <not available>
Filesystem UUID:          98873684-812d-40ae-86ad-5065e17d205b
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype sparse_super large_file
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              655360
Block count:              2620699
Reserved block count:     52413
Free blocks:              2541003
Free inodes:              655349
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      639
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Filesystem created:       Tue Dec  6 07:06:14 2016
Last mount time:          n/a
Last write time:          Tue Dec  6 09:24:16 2016
Mount count:              0
Maximum mount count:      26
Last checked:             Tue Dec  6 07:06:14 2016
Check interval:           15552000 (6 months)
Next check after:         Sun Jun  4 07:06:14 2017
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      784da73d-a979-465d-ae10-5093a3cc0420
Journal backup:           inode blocks
Journal features:         (none)
日志大小:             128M
Journal length:           32768
Journal sequence:         0x00000001
Journal start:            0